I have a 42go server runing for about one and a half years and it has worked fine. Have upgrade this summer to 2.0.4 with no problems. Now has my popserver started messing around. It seems to stop and restart often, some times 3-4 times/hour and then it goes fine for several days. I run postfix and qpopper. The only thing I can se in the logfiles is things like this: in.qpopper: (v4.0.5) Unable to get canonical name of client 184.108.40.206: Name or service not known postfix/smtpd: 19317:error:02001002:system library:fopen:No such file or directory:bss_file.c:104:fopen('/etc/postfix/ssl/cacert.pem','r'): Any ideas?